Determination of temporal changes in seismic velocity caused by volcanic activity in and around Hakone volcano, central Japan, using ambient seismic noise records

Progress in Earth and Planetary Science

Table 1 Average changes in dv/v and their standard deviations at each station for the 2011 Tohoku-oki earthquake and 2013 activity

The average dv/v changes were estimated by subtracting the average dv/v values of term 1 (or 3) from term 2 (or 4). Because a gradual decrease in the velocity was observed at the KOM station prior to the 2013 activity, the average dv/v change during the different periods (1 October to 1 November 2012 and 1 June to 1 July 2013) was also estimated, as noted in parentheses
NA not applicable